Question

（x+y）的绝对值除以（x-y）等于2,求x/y

Answer 1

丨x+y丨/(x-y)=2

丨x+y丨=2(x-y)

(x+y)^2=4(x-y)^2

3x^2-10xy+3y^2=0

(x-3y)(3x-y)=0

x-3y=0,3x-y=0

x/y=3,x/y=1/3